Audio amplifier



FIG. 1 is a perspective view an audio amplifier.

FIG. 2 is a left side view of the audio amplifier shown in FIG. 1.

FIG. 3 is a right view of the audio amplifier shown in FIG. 1.

FIG. 4 is a front view of the audio amplifier shown in FIG. 1.

FIG. 5 is a rear view of the audio amplifier shown in FIG. 1.

FIG. 6 is a bottom view of the audio amplifier shown in FIG. 1; and,

FIG. 7 is a top view of the audio amplifier shown in FIG. 1.

The broken lines show portions of the audio amplifier that form no part of the claimed design. 

I claim the ornamental design for an audio amplifier, as shown and described. 